function s1_goto_dir(){
cd "$1";
}

function s2_touch_empty_file_with_given_name(){
touch "$1"
}

function s3_make_directories(){
mkdir -p projects/{git ,backup}
}


function s4_create_6_files(){
touch projects/linux{1,2}_{centos,redhat,c_programming}
}

function s5_make_directories_in_git(){
mkdir -p projects/git/{linux1,linux2}
}

function s6_move_files_to_dir_1_or_2(){
mv projects/linux1_* projects/git/linux1 && mv projects/linux2_* projects/git/linux2
}


function s7_create_package_and_compress(){
tar -czvf projects/backup/git.tar.gz projects/git
}


function s8_delete_dir_git(){
rm -rf projects/git
}


function s9_recover_from_git_tar_gz_backup(){
tar -zxvf projects/backup/git.tar.gz -C ./
}


function s10_create_package_and_compress(){
tar -jcvf projects/backup/git.tar.bz2 projects/git
}


function s11_find_and_sort_alphabetically_all_created_files_and_dirs(){
find ./projects |sort
}


function s12_get_next_15_minutes_boundary(){
date + '%Y-%m-%d_%H:%M:%S' -d @$(( $(date +%s)/900*900+900)) 
}


